B12 isn't a magic bullet
If youre exploring options to accelerate your weight loss efforts, you might have come across the combination of HCG and Semaglutide
A B complex shot, on the other hand, contains a combination of several B vitamins, including B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), and B12 (cobalamin)
Presented for research literature review only de Bruijn HW et al
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B12 itself doesnt mask other deficiencies, but its possible to have other vitamin deficiencies (like folate or vitamin D) at the same time